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<title>Table 2: Immediate Subattributes of `area'</title>
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&nbsp;<b>Table 2:  Immediate Subattributes of <code>area</code></b><br>
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<b>Attribute</b>
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<b>Mandatory</b>
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<b>Description</b>
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<code>id</code>
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YES
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A 32-bit Integer identifying the area. A value of <b>0</b> always indicates the 
<b>backbone area</b>. If the OSPFv2 session has only one area attribute and it
specifies the backbone area, then the id may be omitted. In this case a default of 
0 is assigned. Otherwise a specification of the id attribute <b>is mandatory</b>!
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<code>stub</code>
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NO
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This is equivalent to the term <i>ExternalRoutingCapability</i> introduced in <i>RFC2328</i>.
When set to <b>true</b>, <i>AS-external-LSAs</i> and <i>Summary-Type-4-LSAs</i> won't be 
flooded into/throughout the area. In this case the area is called <i>a stub</i>. Within stub 
areas, routing to AS external destinations will be based solely on a default summary route. 
The backbone <b>cannot</b> be configured as a stub area.
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<code>stub_default_cost</code>
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NO
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When the area is configured as <i>stub</i> and the OSPFv2 session runs on an area border 
router, then you may assign here a value, indicating the cost of a default summary-LSA 
that the router will advertise into the area. The <b>default value</b> is <b>0</b> indicating 
that no default summary LSA is announced into the area.
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<code>if</code>
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YES
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Encapsulates the attributes of an OSPFv2 interface. Every <i>if</i> corresponds to an
<i>interface</i> attribute specified in <i>router</i>. Therefore the attribute <i>id</i>
in <i>if</i> <b>must</b> have the same value as <i>id</i> in <i>interface</i><b>!</b>
Otherwise it cannot set some parameters correctly. See <a href="table3.html">
<code><b>Table 3</b></code></a> for a description of the configurable OSPFv2 interfaces 
attributes.
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